having won five consecutive Wimbledon championships, five US Open championships, three Australian Open Championships, and the recent French Open championship. Federer's racquet of choice is the Wilson (K) Factor 6.1 Tour 90 (the link provided contains an excellent video review at the bottom of the page). The stick comes in with a 90 sq in head size, head light weight distribution, and a wicked color scheme. The racquet is perfect for advanced players looking for a lot of control. I've hit with this bad boy a couple of times, and I've hit one handed backhands beautifully. The crisp feel each hit produces is extraordinary, accompanied by strong popping sound. If you're an advanced player, give the (K) Tour 90 a try sometime because there is a reason that one of the greatest to ever play the sport uses this frame!